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Not sure about the first, but the second picture is the Magsafe DC in jack (the power in module), part number 820-2361-02, and there is one for sale on eBay here: http://cgi.ebay.co.uk/Apple-MacBook-Pro-Unibody-15%1A-A1286-magsafe-DC-in-jack_W0QQitemZ130367483215QQcmdZViewItem... ;o)

Your issue is very likely to be that system 10.6 is not compatible with PowerBooks. 10.6 is designed only for Intel machines, not Power PC's. This is how to check....boot your PowerBook off an install disc, preferably 10.4 Tiger, and see if you have any audible bloops when you increase and decrease the volume.

I repeatedly had this issue after installing OSX 10.5 and then upgrading it to 10.5.8, eventually I realised that I had only 256MB of ram in the machine, so I swapped it for 1GB, and it booted up straight away. Also worth bearing in mind is that if one of the RAM slots has disappeared, as they do, this may leave you with only 256MB of RAM where you thought you had more! Another way to check what is happening is to boot while holding down Apple key and the letter 'V', this will boot the computer in verbose mode, which will allow you to see how far the machine has got, and if it has stalled.

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If you don't have any plastic bags, you can always print out the photos in black and white as you go, and then tape the screws on to the print outs over the circles that denote the screw positions in the photos. This method helps get every single screw back in it's exact location, even months after a tear down. ;o)